//! HTTP处理器
//! 
//! 实现各种HTTP端点的处理逻辑

use crate::types::*;
use actix_web::{web, HttpResponse, Result as ActixResult};
use serde_json::json;
use serde::{Serialize, Deserialize};
use tracing::info;

/// 执行代码请求
#[derive(Debug, Serialize, Deserialize)]
pub struct ExecuteCodeRequest {
    pub code: String,
    pub language: Language,
    pub timeout_seconds: Option<u32>,
}

/// 沙箱状态响应
#[derive(Debug, Serialize, Deserialize)]
pub struct SandboxStatusResponse {
    pub sandbox_id: String,
    pub state: String,
    pub uptime_seconds: Option<u64>,
    pub usage_count: usize,
    pub health: String,
}

/// 健康检查端点
pub async fn health_check() -> ActixResult<HttpResponse> {
    Ok(HttpResponse::Ok().json(json!({
        "status": "healthy",
        "version": env!("CARGO_PKG_VERSION"),
        "timestamp": chrono::Utc::now().to_rfc3339()
    })))
}

/// 创建沙箱
pub async fn create_sandbox(
    spec: web::Json<SandboxSpec>
) -> ActixResult<HttpResponse> {
    info!("创建沙箱请求: {:?}", spec);
    
    // TODO: 实现沙箱创建逻辑
    let sandbox_id = uuid::Uuid::new_v4();
    
    Ok(HttpResponse::Created().json(json!({
        "sandbox_id": sandbox_id,
        "status": "created",
        "message": "沙箱创建成功"
    })))
}

/// 获取沙箱信息
pub async fn get_sandbox(
    path: web::Path<String>
) -> ActixResult<HttpResponse> {
    let sandbox_id = path.into_inner();
    info!("获取沙箱信息: {}", sandbox_id);
    
    // TODO: 实现获取沙箱信息逻辑
    
    Ok(HttpResponse::Ok().json(json!({
        "sandbox_id": sandbox_id,
        "status": "running",
        "created_at": chrono::Utc::now().to_rfc3339(),
        "language": "python"
    })))
}

/// 执行代码
pub async fn execute_code(
    path: web::Path<String>,
    req: web::Json<ExecuteCodeRequest>
) -> ActixResult<HttpResponse> {
    let sandbox_id = path.into_inner();
    info!("执行代码请求 - 沙箱: {}, 语言: {:?}", sandbox_id, req.language);
    
    // TODO: 实现代码执行逻辑
    let result = json!({
        "success": true,
        "stdout": "Hello, World!",
        "stderr": "",
        "exit_code": 0,
        "execution_time_ms": 42,
        "memory_usage_mb": 25
    });
    
    Ok(HttpResponse::Ok().json(result))
}

/// 获取沙箱状态
pub async fn get_sandbox_status(
    path: web::Path<String>
) -> ActixResult<HttpResponse> {
    let sandbox_id = path.into_inner();
    info!("获取沙箱状态: {}", sandbox_id);
    
    // TODO: 实现状态查询逻辑
    let response = SandboxStatusResponse {
        sandbox_id: sandbox_id.clone(),
        state: "running".to_string(),
        uptime_seconds: Some(120),
        usage_count: 5,
        health: "healthy".to_string(),
    };
    
    Ok(HttpResponse::Ok().json(response))
}

/// 销毁沙箱
pub async fn destroy_sandbox(
    path: web::Path<String>
) -> ActixResult<HttpResponse> {
    let sandbox_id = path.into_inner();
    info!("销毁沙箱: {}", sandbox_id);
    
    // TODO: 实现沙箱销毁逻辑
    
    Ok(HttpResponse::Ok().json(json!({
        "sandbox_id": sandbox_id,
        "status": "destroyed",
        "message": "沙箱销毁成功"
    })))
}

/// 获取统计信息
pub async fn get_stats() -> ActixResult<HttpResponse> {
    info!("获取系统统计信息");
    
    // TODO: 实现获取统计信息逻辑
    
    Ok(HttpResponse::Ok().json(json!({
        "total_sandboxes": 100,
        "active_sandboxes": 50,
        "pool_stats": {
            "hot_pool": { "total": 20, "available": 15 },
            "warm_pool": { "total": 30, "available": 20 },
            "cold_pool": { "total": 50, "available": 45 }
        },
        "memory_usage": "65%",
        "cpu_usage": "35%",
        "timestamp": chrono::Utc::now().to_rfc3339()
    })))
}

/// 获取Prometheus指标
pub async fn get_metrics() -> ActixResult<HttpResponse> {
    info!("获取Prometheus指标");
    
    // TODO: 集成实际的Prometheus指标
    let metrics = r#"
# HELP sandbox_total Total number of sandboxes
# TYPE sandbox_total gauge
sandbox_total 100

# HELP sandbox_active Active sandboxes
# TYPE sandbox_active gauge
sandbox_active 50

# HELP sandbox_pool_size Pool sizes by type
# TYPE sandbox_pool_size gauge
sandbox_pool_size{pool="hot"} 20
sandbox_pool_size{pool="warm"} 30  
sandbox_pool_size{pool="cold"} 50

# HELP sandbox_allocation_duration_seconds Sandbox allocation duration
# TYPE sandbox_allocation_duration_seconds histogram
sandbox_allocation_duration_seconds_bucket{le="0.005"} 100
sandbox_allocation_duration_seconds_bucket{le="0.01"} 150
sandbox_allocation_duration_seconds_bucket{le="0.025"} 180
sandbox_allocation_duration_seconds_bucket{le="0.05"} 195
sandbox_allocation_duration_seconds_bucket{le="0.1"} 198
sandbox_allocation_duration_seconds_bucket{le="0.25"} 199
sandbox_allocation_duration_seconds_bucket{le="0.5"} 200
sandbox_allocation_duration_seconds_bucket{le="1"} 200
sandbox_allocation_duration_seconds_bucket{le="+Inf"} 200
sandbox_allocation_duration_seconds_sum 5.5
sandbox_allocation_duration_seconds_count 200
"#;
    
    Ok(HttpResponse::Ok()
        .content_type("text/plain; version=0.0.4")
        .body(metrics))
}